Garip Genc

Marmara University · Department of Mechatronics Engineering

Forging is one of the most important production methods in applications where the disadvantages of machining are not desired. However, the possibility of micro-cracking in the material at the end of the forging process should be considered. The main constraints here are the aging of hydraulic systems and possible casting defects. Therefore, in this...

Natural fibers are increasingly used for polymer composite intending to minimize the environmental impact. Bio-composite materials are increasingly being used in industrial transport structures, including aerospace and automotive. Natural fiber reinforces composites with equivalent performances of glass fiber composites, have higher amount of fiber...

Forging is one of the most important production methods in applications where the disadvantages of machining are not desired. However, the possibility of micro-cracking in the material at the end of the forging process should be considered. The main constraints here are the aging of hydraulic systems and possible casting defects. Therefore, in this...

In this study, the acoustic and mechanical properties of many biofibers and their composites are presented. First, the sound absorption coefficients and transmission losses of commonly used natural fibers and their composites are presented, by clearly reporting the thickness of the samples, for three different frequency ranges (<500 Hz: low, 500–20...

Although there are many studies in the literature on the static mechanical properties of biomaterials such as tensile strength, the dynamic mechanical properties of biomaterials such as modal loss factors have not been investigated in detail. In this study, the Young’s moduli and damping (or loss factors) of some jute and luffa fiber-reinforced bio...

In this research, a bio-based graft copolymer (LCC-g-PCL) based on the cellulose of Luffa cylindrica (LCC) main chain possessing poly(ɛ-caprolactone) (PCL) pendant groups is synthesized through a grafting from approach via ring-opening polymerization (ROP). For this purpose, LCC, extracted from luffa sponges by combined method, is utilized for ROP...

Purpose This paper aims to address the production of biocomposite nanofibers using luffa natural fibers and polyaniline conductive polymer/polyethylene oxides (PANI/PEO). Design/methodology/approach In this study, luffa natural fibers are extracted by chemical method. After mixing the treated luffa (TL) with the PANI/PEO solution, TL/PANI/PEO nano...

Impedance tube method is widely used to measure acoustic properties of materials. Although this method yields reliable acoustic properties for soft textured materials, uncertainty levels of measured acoustic properties for hard materials, including biocomposites, can be quite large, mainly due to uncertain mounting conditions. Here, the effects of...

Purpose The purpose of this study is to reveal the usability of waste paper sludge on the production of composite materials and the printability of their surfaces were investigated. Design/methodology/approach First, composite plates were produced by using dried and milled waste sludge together with polyester resin and epoxy. Screen printing using...

Hidrojen enerjisi dizel tren setlerinin yol açtığı hava kirliliği, gürültü kirliliği gibi dezavantajları ortadan kaldırdığı gibi elektrikli tren setlerinin ihtiyaç duyduğu pahalı elektrifikasyon alt yapısı ve görüntü kirliliğinin de olumsuz etkilerini ortadan kaldırmaktadır. Bu olumlu özelliklere karşı hidrojenin yüksek basınç altında depolanması g...

Micro Electro-Mechanical System (MEMS) based devices offer innovative approaches in sensor technologies with the advantages of high efficiency and miniaturization. The most important stage in the development of new generation MEMS-based devices is the design and optimization stage. However, device design and optimization processes are developed in...

In order to promote the use of natural fibers in noise and vibration applications, the properties of these structures should be fully identified. The sound absorption coefficients (SACs) and transmission losses (TLs) of green luffa fiber samples are thoroughly investigated and their acoustic performances are compared with the acoustic performances...

The acoustic properties of natural fiber-reinforced composites should be 10 identified before using these materials in various engineering applications including sound and vibration isolation. This study investigates the effects of sample thickness and fiber/resin ratio on the acoustic performance of jute and luffa fiber-reinforced biocomposites. F...

The most important reason why natural fibers are not sufficiently involved in applications is the large scattering of their properties. In addition, it is very difficult to find one kind of natural fiber which has perfect mechanical properties like synthetic fibers. Here, we aimed to find solutions by developing a hybrid composite according to the...

Design and development of new biomaterials has become a necessity due to adverse effects of chemical materials on people and nature. As the mechanical properties of biomaterials are not as good as those of chemical materials, their different configurations should be developed and tested before considering them for practical applications. Acoustic a...

Traditional printed circuit board (PCB) laminates such as FR4 types are formed using epoxy resin and glass fiber. The most important problem with waste PCB laminates is that their recycling cycle is too long. Here, we aimed to show whether it is possible or not to use plant-based fibers instead of petroleum-based fibers. In this study, we have fabr...

z Bu çalışmada, kabak lifi takviyeli bitkisel kompozit malzemelerin yüzey topografyasının basılabilirliğine etkisi incelenmiştir. Bu amaçla, takviye olarak kabak lifi ve matris olarak epoksi kullanılarak biyo-kompozit plakalar üretilmiştir. Daha sonra bu plakaların yüzeylerine çizgi ve nokta gibi baskılar serigrafi baskı yöntemi ile gerçekleştirilm...

In this study, a hemispherical head with pad reinforced central nozzle opening that subjected to uniform internal pressure was investigated using Finite Element Methods (FEM) to understand the design procedure. This procedure is handled according to the ASME Boiler and Pressure Vessel Code Section VIII Division 2. This standard contains two parts f...

This chapter presents an overview of the acoustic and mechanical behaviors of luffa fiber-reinforced biocomposites. A growing number of studies are examining the composites of biodegradable fibers such as flax, hemp, kenaf, and luffa because of the adverse effects of their chemical materials on nature. Their low cost and the superior acoustic and a...

Faced with the depletion of natural resources and the threat of a major reduction in clean air producing areas, the focus is on recycling-oriented studies. Particularly, instead of wood and plastic materials which are widely used in furniture, packaging, coating and construction industries, the search for alternative materials has gained significan...

The present study has investigated the effect of the roving tension (pretension force) on the strength of continuous carbon fiber used in the Filament Winding (FW) process. Pretension force is generally applied to composite products manufactured by FW technology to lay out the carbon fiber onto the cylindrical tube in a correct way. However, a cons...

Luffa cylindrica plant fiber is a new biodegradable engineering material. However, the dynamic behaviors of these new green materials or their composites should be explored to consider them for practical applications. The dynamic characteristics including modal behavior and the elastic and sound isolation properties of luffa-based bio-composite pla...

Defects and structural differences in raw bio materials such as luffa plant result in large scattering mechanical properties such as density, damping and elasticity modulus. There are difficulties during the manufacturing process of the composites reinforced by bio materials inherent to the nature of bio materials The major problems and restriction...

New materials as alternatives to petroleum-based composite materials are needed due to adverse effects of chemical materials on nature. On the other hand, there is a need to characterize and evaluate new alternative materials to be effectively used in practical applications. The vibro-acoustic behaviors including damping and elastic properties, sou...

Considering the adverse effects of petroleum-based materials on nature, finding and developing new materials as alternatives to these chemical materials become a necessity in practice. On the other hand, these new materials need characterization to be considered and effectively used in practical applications. The acoustic properties of luffa bio fi...

In this study a caliper simulation was developed as computer application for using in the Vocational Education and Training (VET) and Distance-based training. This simulation was developed for teaching the Metric and Whitworth measurement systems. The developed caliper simulation introduced in detail step by step as user guide. The vernier scales a...

The aim of this study to investigate the dynamic properties of luffa cylindrica fiber reinforced bio-composite as alternative natural composite materials. As dynamic properties resonance frequencies and damping measured both for the bio-composite and chemical composite materials. To able to compare the properties of natural fiber and chemical fiber...

Plantal-based bio-composite materials produced to identify Young’s Modulus (Elasticity Modulus) using vibration method of which belongs to these materials are presented in this study. In composite production process it is used epoxy as a matrix to perform comparison although it is petroleum based material. Mechanical properties of bio-composite mat...

The simulation of the heat that was the result of the interface between the cutting tool and the work piece during the orthogonal cutting operation at the shaper with numerical modeling was studied in this study. The heating up of the workpiece in machining and the cutting tool is directly proportional to the efficiency and the quality of the cutti...

In this paper, the comparison of static and dynamic properties of flax and glass fiber composite materials is presented. For this comparison, dynamic and quasi-static experimental studies were carried out. As a dynamic test, vibration tests were fulfilled using the Oberst apparatus and the tensile test was fulfilled by a quasi-static test. The vibr...

In this study, fixed sheet metal, which are made of same material and at the same dimensions, are welded with speeds of 4 mm/sn, 7 mm/sn and 10 mm/sn by using robotic welding system. During welding process, measurement of heat was done by using thermocouple. After welding process, it is waited for a while for cooling of sheet metal down to room tem...

The aim of this study is to discuss and propose a syllabus of Finite Element Analysis (FEA) in the International Welding Engineer Education. The welding process is a complicated manufacturing process and contains more than one engineering discipline such as mechanical and metallurgical engineering. The complicated scientific aspect makes it also di...

The effect of impact loading on Carbon Fiber Reinforced Plastic (CFRP) composite tube without and with high internal pressure has been investigated by FEM simulation in the present study. Composite tube which has an Aluminum cylinder and wound by carbon fiber was simulated by using 3-D model. MARC-Mentat commercial code has been selected as a compu...

In this study, residual stresses in sheet metal test pieces, which are made of same material and having the same dimensions and welded with speeds of 4 mm/s, 7 mm/s and 10 mm/s by using robotic welding system has been studied. During welding process, measurement of temperature was done by using thermocouple. After welding process, it is waited for...

Bu çalışmada, bir fikstüre sabitlenmiş aynı malzemeden, aynı ebatlarda levha malzemenin robotlu kaynak sistemi kullanılarak 4 mm/s, 7 mm/s ve 10 mm/s hızlarında kaynatılmasını takiben ortaya çıkan kalıntı gerilmeleri araştırılmıştır. Kaynak esnasında termokupul kullanılarak sıcaklık ölçümü yapılmıştır. Kaynak işlemi sonrasında oda sıcaklığına kadar...

Design, testing, and FEM simulation of FRP structural parts manufactured using continuous fiber and light-curing resin are presented in this study. The structures can be described as formed by girders spaced by skew ribs. The study was limited to plane structures with two girders and 45° ribs between girders. Roving was positioned along the girders...